JP3798881B2 - Keriba anti-vibration device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an excavator equipped with an excavating blade that rotates at the tip, and to a kelly bar anti-vibration device that stops the excursion of the kelly bar to which an auger drill is attached.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there has been known a kelly bar anti-skid device that supports an anti-sway of a kelly bar so that it can be moved up and down by a reader, and stops the kelly bar from shaking during construction. In such an apparatus, the tip of the wire from the winch mounted on the construction machine main body is fastened to the shaking table, and the shaking table is moved up and down along the leader by driving the winch. At the time of construction and pulling out, the operator operates the winch to raise and lower the shaking table in accordance with the raising and lowering of the Keriba.
[0003]
[Problems to be solved by the invention]
However, in such a conventional apparatus, if the lifting / lowering operation of the shaking table according to the lifting / lowering of the kelly bar is neglected at the time of excavation and pulling out, the kelly bar or the excavating tool and the shaking table interfere with each other. Interference with the kelly bar during excavation causes excessive tension to act on the wire that suspends the brace, causing breakage of the wire. In addition, there is a problem that the wire is loosened when pulled out, which causes the winding of the winch drum.
[0004]
An object of the present invention is to provide a kelly bar anti-vibration device that prevents interference with an anti-vibration table during excavation and extraction.
[0005]
[Means for Solving the Problems]
In order to achieve this problem, the present invention has taken the following measures in order to solve the problem. That is,
In the kelly bar anti-skid device that supports the anti-sway of the kelly bar so that it can be raised and lowered by the reader,
A sheave is rotatably supported on the shaking table,
A kelly bar anti-skid device characterized in that a wire from a winch is wound around the sheave and the tip of the wire is fastened to a connecting member fixed to the tip of the kelly bar and the anti-rest is suspended. is there.
[0006]
The kelly bar may be suspended from a main wire from a main winch mounted on a construction machine main body, and an excavating tool may be attached to the lower end of the kelly bar. Alternatively, a lower brace that stops the kelly bar from swinging may be supported on the lower end side of the reader so as to be movable up and down. Further, the kelly bar may be connected to a rotary drive mechanism that is moved up and down along the reader.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, reference numeral 1 denotes a self-propelled construction machine main body, and a leader 2 is supported by a stay 4 and a catching hawk 6 so as to be tilted up and down. Two long guide rails 8 and 10 (see FIG. 2) are laid on the front surface of the reader 2 along the longitudinal direction thereof.
[0008]
A main winch 12 is mounted on the construction machine main body 1, and a main wire 14 drawn from the main winch 12 is drawn along the leader 2, and a sheave 16 rotatably supported in the middle of the leader 2 is provided. Via a sheave 18 rotatably supported on the upper end of the reader 2. Furthermore, after the main wire 14 is stretched between the hanging sheave 20 and the sheave 22 provided at the upper end of the reader 2, one end thereof is fixed to the upper end of the reader 2. The suspended sheave 20 is connected to the tip of the kelly bar 26, and its cross-sectional shape is formed into a square hollow shape.
[0009]
As shown in FIG. 1, a drilling tool 28 is attached to the lower end of the kelly bar 26. The drilling tool 28 includes a disc-shaped drilling blade 30 that is driven to rotate by a built-in hydraulic motor (not shown) and is hydraulic. A drilling blade 32 in which a drilling bit is planted on a link of a chain that is rotationally driven by a motor is also provided.
[0010]
As shown in FIG. 2, the guide rails 8 and 10 support a swaying table 34 through a pair of guide gigs 36 and 38 so as to be slidable. First and second guide arms 40 and 42 are supported on the swing table 34 so as to be swingable by pins 44 and 46 parallel to the kelly bar 26.
[0011]
A third guide arm 48 is pivotally connected to the tip of the first guide arm 40 by a pin 50. The distal end of the second guide arm 42 and the distal end of the third guide arm 48 are connected by a detachable pin 52. A sliding hole 54 corresponding to the outer peripheral shape of the Kelly bar 26 is formed by being surrounded by the shaking table 34 and the first to third guide arms 40, 42 and 48.
[0012]
As shown in FIG. 3, a rectangular accommodation hole 56 penetrating in the vertical direction is formed in the shaking table 34. A sheave 58 is accommodated in the accommodation hole 56, and the sheave 58 is rotatably supported by the anti-rest 34 by a pin 60 and a bearing 62 inserted into the anti-static base 34.
[0013]
The wire 66 drawn from the winch 64 mounted on the construction machine main body 1 passes through the sheave 67 provided in the middle of the reader 2 as shown in FIGS. It spans over sheaves 69a and 69b provided at the upper end. Thereafter, the wire 66 is pulled down along the leader 2 and is wound around the sheave 58 of the shaking table 34. The distal end of the wire 66 is fastened to a connecting member 68 fixed to the distal end side of the Kelly bar 26. It should be noted that the shaking table 34 needs to move up and down during the assembly of the kelly bar 26. At this time, the winch 64 is driven as necessary.
[0014]
Further, as shown in FIG. 1, a lower brace 70 is slidably supported on the guide rails 8 and 10. The lower brace 70 has the same configuration as the brace 34 except that the sheave 58, the pin 60, and the bearing 62 are not provided, and a detailed description thereof will be omitted.
[0015]
Next, the operation of the above-described kelly bar anti-skid device of this embodiment will be described.
First, the kelly bar 26 is lifted by the main wire 14, and the kelly bar 26 is mounted between the opened first guide arm 40 and the second guide arm 42 as shown by a two-dot chain line in FIG. 2. Then, the third guide arm 48 is swung, and the second guide arm 42 and the third guide arm 48 are connected by the pin 52. As a result, the kelly bar 26 is slidable in the axial direction, but the back-and-forth and right-and-left shake is restricted. Similarly, the lower brace 70 supports the kelly bar 26 so as to be slidable in the axial direction, and restricts back-and-forth and left-right wobbling.
[0016]
Then, the excavator 28 is attached to the lower end of the kelly bar 26, and the winch 64 is driven to wind or unwind the wire 66 so that the shaking table 34 is moved up and down so as to come to an intermediate position of the kelly bar 26. Driving stops. Subsequently, the main winch 12 is driven to drive the main wire 14 while driving the excavating blades 30 and 32 of the excavator 28. Thereby, the keriva 26 and the excavator 28 are lowered by their own weight and excavation is started.
[0017]
At that time, the kelly bar 26 is prevented from shaking by the shaking table 34 and the lower shaking table 70 according to the distance between the two tables 34 and 70. As the kelly bar 26 is lowered, the tip of the wire 66 is lowered together with the connecting member 68. Therefore, although the swinging table 34 is also lowered, since the wire 66 is wound around and fixed to the winch 64, the amount of the descent is half of the amount of the kelly bar 26 that is lowered. On the other hand, when the lower brace 70 is lowered by its own weight and reaches the lower end of the reader 2, it comes into contact with a stopper or the like (not shown) and further lowering is restricted.
[0018]
When the excavation progresses until the upper end of the Kelly bar 26 almost reaches the lower end of the leader 2, as shown in FIG. 5, the shaking table 34 and the lower shaking table 70 are arranged at the lower end of the leader 2. And if the main winch 12 is driven from this state and the main wire 14 is wound up, the kelly bar 26 and the excavation tool 28 will be pulled out from underground. At that time, since the tip of the wire 66 is pulled up together with the kelly bar 26, the anti-rest 34 rises along the guide rails 8 and 10. The amount of increase at that time is half that of Keriba 26.
[0019]
In this way, when excavating to lower the kelly bar 26 or pulling out to raise the kelly bar 26, the shaking table 34 moves up and down in accordance with the raising and lowering of the kelly bar 26 without driving the winch 64. Therefore, the operator does not need to pay attention to the driving of the winch 64 during excavation or extraction, and the operation is facilitated, and the shaking table 34, the kelly bar 26, and the excavator 28 do not interfere with each other.
[0020]
As shown in FIG. 6, the tip of the kelly bar 82 is connected to the rotary drive mechanism 80 supported by the guide rails 8 and 10 of the reader 2 so as to be movable up and down, and the auger drill 84 is connected to the lower end of the kelly bar 82. The same can be done when excavating. In this case, the distal end of the wire 66 may be fastened to the rotational drive mechanism 80 on the distal end side of the kelly bar 82.
[0021]
Since the cross-sectional shape of the kelly bar 82 is circular, the anti-rest table 34 may be formed so that the sliding hole 54 has a circular shape and support the kelly bar 82 so as to be rotatable and slidable in the axial direction. . Thus, as described above, the anti-rest 34 is moved up and down as the rotary drive mechanism 80 is moved up and down, so that the operator can operate the rotary drive mechanism 80 and the auger drill 84 and the anti-vibration without operating the winch 64. There is no interference with the base 34.
[0022]
The present invention is not limited to such embodiments as described above, and can be implemented in various modes without departing from the gist of the present invention.
[0023]
【The invention's effect】
As described above in detail, the kelly bar anti-vibration device of the present invention moves up and down in response to the raising and lowering of the kelly bar without driving the winch at the time of excavation or pulling out. It is not necessary to pay attention to the drive of the winch at the time of pulling out, so that the operation becomes easy and the interference with the shaking table can be prevented. At the time of assembling the keriva, the shaking table can be raised and lowered freely. Further, by providing the lower rest table, it is possible to surely prevent the kelly bar from shaking.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a side view of a construction machine using a Keriba swinging apparatus as one embodiment of the present invention.
FIG. 2 is an enlarged plan view of the Keriba swing prevention device of the present embodiment.
FIG. 3 is an enlarged side view showing a part of the Keriba anti-vibration device of the present embodiment in cross section.
FIG. 4 is a schematic perspective view showing the drawing of the wire of the Kelly bar anti-vibration device of the present embodiment.
FIG. 5 is an explanatory diagram at the time of excavation by a construction machine using the kelly bar anti-vibration device of the present embodiment.
FIG. 6 is a side view of a construction machine using a Keriba anti-vibration device as another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Construction machine main body 2 ... Leader 12 ... Main winch 14 ... Main wire 26, 82 ... Keriba 28 ... Excavator 34 ... Shaking table 58 ... Sheave 64 ... Winch 66 ... Wire 70 ... Lower shaking table 80 ... Rotation drive mechanism 84 ... Auger drill

Claims (4)

In the kelly bar anti-skid device that supports the anti-sway of the kelly bar so that it can be raised and lowered by the reader,
A sheave is rotatably supported on the shaking table,
A kelly bar anti-vibration device characterized in that a wire from a winch is wound around the sheave and the tip end of the wire is fastened to a connecting member fixed to the tip end side of the kelly bar to suspend the anti-rest unit. The kelly bar anti-skid device according to claim 1, wherein the kelly bar is suspended from a main wire from a main winch mounted on a construction machine main body, and an excavator is attached to a lower end of the kelly bar.   3. The kelly bar anti-skid device according to claim 2, wherein a lower anti-rest table for stopping the kelly bar swinging is supported on the lower end side of the reader so as to be movable up and down.   The kelly bar anti-vibration device according to claim 1, wherein the kelly bar is connected to a rotary drive mechanism that moves up and down along the reader.

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